Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Christopher Mullany Mcmackin, MD

Internal Medicine Physician in Washington, DC · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1255345096

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Registry record

Entity type Individual (Type 1)

Name Dr. Christopher Mullany Mcmackin

Credential MD

Sex Male

Practice address 2311 M St Nw, Suite 302, Washington, DC, 20037

Phone (202) 296-0043

Fax (202) 296-1306

Enumeration date Jul 28, 2006

Last updated in NPPES Oct 22, 2013

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 16615 (DC) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
025969800	Medicaid	DC	-

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What is the NPI number for Christopher Mcmackin?

The National Provider Identifier (NPI) for Christopher Mcmackin is 1255345096, a Type 1 (individual) record in the CMS NPPES registry.

Where does Christopher Mcmackin practice?

The practice location on file with NPPES is in Washington, DC. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-10-22.